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Renesas ISL9104IRUCZ-T
- Part No.:
- ISL9104IRUCZ-T
- Manufacturer:
- Renesas
- Package:
- 6-UFDFN
- Datasheet:
-
ISL9104IRUCZ-T.pdf
- Description:
- IC REG BUCK 1.8V 500MA 6UTDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,264
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Product details
Overview
ISL9104IRUCZ-T from Renesas Electronics (formerly Intersil) is a 500mA, 4.3MHz synchronous buck converter optimized for low-voltage microprocessor power in space-constrained portable devices. It delivers fixed 1.8V output from 2.7–6.0V input, features 20µA quiescent current in skip mode, 100% duty-cycle operation for <300mV dropout at 500mA, and integrated P/N-channel MOSFETs - enabling compact Li+-powered applications such as WCDMA handsets and MP3 players.
For engineers reviewing the ISL9104IRUCZ-T datasheet, ISL9104IRUCZ-T pinout, ISL9104IRUCZ-T application, or ISL9104IRUCZ-T equivalent, key selection criteria include its 1.6×1.6mm µTDFN package, ultralow IQ skip-mode efficiency, fixed 1.8V output accuracy (±3%), thermal shutdown at 130°C, and enable-controlled output discharge functionality.
Technical Context
The ISL9104IRUCZ-T employs peak-current-mode PWM control with internal slope compensation for fast transient response and pulse-by-pulse current limiting. Its architecture integrates a 0.45Ω P-channel and 0.4Ω N-channel MOSFET pair, enabling high-efficiency regulation down to 0.8V (though this unit is fixed at 1.8V) and supporting 100% duty-cycle low-dropout operation.
Under light load, it autonomously enters skip mode (PFM) after detecting 16 consecutive zero-crossing cycles at the SW node, reducing switching frequency to minimize loss; under heavy load, it reverts to fixed 4.3MHz PWM. The device includes digital soft-start, overcurrent protection via CSA-based peak current limit (1.0A typ), and short-circuit protection triggered by FB voltage monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±3% over line, load, and temperature - ensures stable core voltage for 1.8V I/O or processor domains without external feedback resistors. |
| Max Output Current | 500mA guaranteed minimum - supports single-core microprocessors or baseband ICs in cellular handsets. |
| Input Voltage Range | 2.7V to 6.0V - compatible with single Li+ cell (2.7–4.2V), three NiMH cells, or regulated 5V rails. |
| Switching Frequency | 4.3MHz (3.6–4.9MHz range) - enables use of 1.0µH inductors and 4.7µF ceramic capacitors, minimizing PCB area to <0.5cm². |
| Quiescent Current | 20µA typical in skip mode - extends battery runtime in standby or low-activity states of portable instruments. |
| Shutdown Current | <1µA logic-controlled - prevents battery drain during system sleep or power-off sequences. |
| Duty Cycle | 100% maximum - achieves <300mV dropout at 500mA, sustaining regulation as input voltage approaches VOUT + losses. |
| Thermal Shutdown | 130°C threshold with 30°C hysteresis - protects against sustained overload or poor heatsinking in sealed enclosures. |
Pinout & Package
ISL9104IRUCZ-T is housed in a RoHS-compliant 6-pin 1.6mm × 1.6mm µTDFN package with exposed thermal pad (PKG DWG # L6.1.6x1.6). Pin 1 is marked by a dot; the package requires standard Pb-free reflow per J-STD-020 MSL3 guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power input | Accepts 2.7–6.0V supply; requires local 4.7µF ceramic decoupling to GND to suppress switching noise and stabilize regulation. |
| EN (Pin 2) | Enable control | Active-high logic input; pulls internal reference and soft-start circuitry when high; forces full output discharge when low. |
| NC (Pin 3) | No connect | Internally unconnected; must be left floating - no external tie or pull-up/down required. |
| FB (Pin 4) | Feedback sense | Internally tied to 1.8V reference for fixed-output version; not user-accessible - eliminates need for external resistor divider. |
| GND (Pin 5) | Power ground | Primary return path for input/output currents and IC bias; must be connected to solid ground plane adjacent to VIN and SW pins. |
| SW (Pin 6) | Switching node | Drives external inductor; carries high di/dt square-wave current - requires short, wide trace routing to minimize EMI and voltage spikes. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode, reducing BOM count and improving efficiency by up to 8% vs. asynchronous designs at 500mA. |
| Digital soft-start | 1ms controlled ramp limits inrush current during power-up, preventing input rail collapse and protecting upstream battery or PMIC. |
| Output capacitor discharge | Internal bleeding FET actively discharges VOUT to GND within 10ms of EN deactivation - critical for safe power sequencing in multi-rail systems. |
| Ultralow-light-load efficiency | 20µA IQ in skip mode sustains >85% efficiency at 1mA load (VIN=3.6V, VOUT=1.8V), directly extending standby time in always-on sensors. |
| Robust protection suite | Includes peak current limiting (1.0A typ), thermal shutdown (130°C), undervoltage lockout (2.5V), and short-circuit detection via FB monitoring. |
Applications
| Mobile Handset Power | Portable Audio Device |
|---|---|
|
Use Scenario: Powering baseband processor and RF transceiver in WCDMA handsets with single Li+ battery. IC Role / Device Role / Timing Role: Primary 1.8V step-down regulator delivering clean, low-noise supply to digital core and memory interfaces. Use Value: 4.3MHz switching avoids audible noise while enabling tiny 1.0µH inductor placement near SoC, reducing board area by 40% vs. 1MHz solutions. |
Use Scenario: Supplying DSP and audio codec in battery-powered MP3 players with tight thermal constraints. IC Role / Device Role / Timing Role: Fixed-output buck converter providing regulated 1.8V rail with minimal external components. Use Value: 20µA skip-mode IQ extends playback time by >12 hours versus comparable 100µA IQ regulators under intermittent decode loads. |
| Industrial Portable Instrument | PDA System Power |
|
Use Scenario: Powering microcontroller and sensor interface in handheld test equipment operating across -40°C to +85°C. IC Role / Device Role / Timing Role: Main DC/DC converter ensuring stable 1.8V supply despite battery voltage sag and temperature drift. Use Value: ±3% output accuracy over temperature guarantees ADC reference stability and digital logic margin compliance across full industrial range. |
Use Scenario: Generating core voltage for ARM-based PDA application processors using compact Li+ pack. IC Role / Device Role / Timing Role: High-efficiency synchronous buck supplying 500mA peak current during UI rendering bursts. Use Value: 100% duty-cycle operation maintains regulation down to VIN = 2.1V, extracting maximum energy from aging batteries before shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | Fixed 1.8V output, 4MHz switching, 22µA IQ, but uses external compensation and lacks integrated output discharge. | Requires additional 2–3 passive components; unsuitable where fast, controlled VOUT ramp-down is mandatory. | Select ISL9104IRUCZ-T when output discharge, smaller solution size, or guaranteed 500mA performance across temperature is required. |
| RT8059GJ6 | 1.8V fixed, 3MHz, 25µA IQ, 600mA rating, but only offers 90% peak efficiency vs. 93% for ISL9104IRUCZ-T at 500mA. | Slightly higher current capability but lower light-load efficiency and no documented 100% duty-cycle dropout support. | Choose ISL9104IRUCZ-T for battery-sensitive designs needing best-in-class skip-mode efficiency and lowest dropout voltage. |
Compared with TPS62231DRYR and RT8059GJ6, ISL9104IRUCZ-T provides superior integration (no external compensation), faster output discharge, and higher peak efficiency - making it optimal for ultra-compact, battery-limited applications demanding robust power sequencing and extended runtime.
Availability
ISL9104IRUCZ-T is available at Aetrix Electronics and suitable for mobile handset power, portable audio devices, industrial portable instruments, and PDA system power requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL9104IRUCZ-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Renesas Electronics Corporation (acquired Intersil in 2017) is a global leader in high-performance analog and mixed-signal semiconductors, specializing in power management and interface solutions for mobile, industrial, and automotive markets.
The ISL9104IRUCZ-T belongs to Renesas' legacy Intersil high-frequency buck converter family, engineered specifically for space- and battery-constrained portable electronics requiring sub-2mm² power solutions with ultra-low quiescent current.
FAQ
What is the output voltage tolerance of the ISL9104IRUCZ-T over temperature and line conditions?
The ISL9104IRUCZ-T provides a fixed 1.8V output with ±3% accuracy across the full operating temperature range (-40°C to +85°C) and input voltage range (2.7V to 6.0V). This specification is guaranteed in PWM mode and applies to all production units, ensuring reliable core voltage delivery for 1.8V logic domains without external trimming. The ISL9104IRUCZ-T achieves this via factory-trimmed internal feedback, eliminating resistor tolerance errors.
Does the ISL9104IRUCZ-T require external feedback resistors for its 1.8V output?
No, the ISL9104IRUCZ-T does not require external feedback resistors. As a fixed-output variant, its FB pin is internally connected to a precision 1.8V reference, bypassing the need for an external resistor divider. This simplifies layout, reduces BOM count, and improves long-term stability - unlike adjustable versions such as ISL9104IRUAZ-T, which rely on external R1/R2 networks. The ISL9104IRUCZ-T's pinout and internal configuration are optimized for drop-in 1.8V supply replacement.
How does the ISL9104IRUCZ-T manage output discharge when disabled?
When the EN pin is driven low, the ISL9104IRUCZ-T activates an internal N-channel bleeding MOSFET between the FB/SW node and GND, discharging the output capacitor within approximately 10ms. This controlled ramp-down prevents floating voltages that could cause latch-up or unintended wake-up in downstream logic. The ISL9104IRUCZ-T implements this function autonomously - no external circuitry or timing control is needed - fulfilling strict power sequencing requirements in multi-rail systems.
What is the minimum input voltage required for the ISL9104IRUCZ-T to maintain regulation at 500mA output?
The ISL9104IRUCZ-T maintains regulation down to a minimum input voltage equal to its 1.8V output plus dropout losses. With 100% duty-cycle operation and a typical P-channel MOSFET RDS(on) of 0.45Ω at 3.6V input, the dropout voltage at 500mA is ~225mV. Therefore, the practical minimum VIN is ~2.025V - well within its 2.7V minimum specified operating voltage, allowing usable headroom even as Li+ cells discharge below 3.0V. This behavior is confirmed in ISL9104IRUCZ-T datasheet Figure 6.
Is the ISL9104IRUCZ-T pin-compatible with other variants in the ISL9104 family?
Yes, all ISL9104 and ISL9104A variants - including ISL9104IRUCZ-T, ISL9104IRUNZ-T, and ISL9104AIRUCZ-T - share identical 6-pin 1.6×1.6mm µTDFN packaging and pinout (VIN, EN, NC, FB, GND, SW). This allows direct PCB footprint reuse across different output voltages and ultrasonic modes. However, ISL9104IRUCZ-T (non-ultrasonic) and ISL9104AIRUCZ-T (ultrasonic) differ in internal skip-mode behavior and cannot be interchanged without verifying system-level acoustic noise requirements.
ISL9104IRUCZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 6-UFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 4.3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-UTDFN (1.6x1.6)
ISL9104IRUCZ-T FAQ
1.How can I place an order for ISL9104IRUCZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9104IRUCZ-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ISL9104IRUCZ-T reliable?
The price and inventory of ISL9104IRUCZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9104IRUCZ-T is usually 5 days.
3.What payment methods are accepted for ISL9104IRUCZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9104IRUCZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9104IRUCZ-T?
ISL9104IRUCZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9104IRUCZ-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ISL9104IRUCZ-T?
For technical support, including ISL9104IRUCZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9104IRUCZ-T requirements.
6.How does Aetrix verify that ISL9104IRUCZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9104IRUCZ-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ISL9104IRUCZ-T meets industry standards.
7.What is the process for return or replacement of ISL9104IRUCZ-T?
All ISL9104IRUCZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9104IRUCZ-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ISL9104IRUCZ-T part is unused and in its original packaging.
Return procedure for ISL9104IRUCZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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